Rubber blanket for offset printing

Abstract

The present invention provides a rubber blanket for an offset printing, comprising a surface rubber layer, a first fabric layer, a compressible layer and a second fabric layer, wherein the thickness of the blanket falls within a range of between 1.65 mm and 3 mm, the first fabric layer is a plain weave having a thickness falling within a range of between 0.2 mm and 0.35 mm, the second fabric layer is a plain weave having a thickness falling within a range of between 0.35 mm and 0.55 mm, a tensile strength not lower than 50 kgf/cm, and an elongation at break not higher than 7.5%, and the compressible layer has a thickness falling within a range of between 0.5 mm and 2.15 mm.

1. A rubber blanket for an offset printing, comprising:
 a surface rubber layer;  
 a first fabric layer bonded to the lower surface of said surface rubber layer;  
 a compressible layer bonded to the lower surface of said first fabric layer; and  
 a second fabric layer bonded to the lower surface of said compressible layer;  
 wherein: 
 the thickness of the blanket falls within a range of between 1.65 mm and 3 mm;  
 said first fabric layer is a plain weave having a thickness falling within a range of between 0.2 mm and 0.35 mm;  
 said second fabric layer is a plain weave having a thickness falling within a range of between 0.35 mm and 0.55 mm, a tensile strength not lower than 50 kgf/cm, and an elongation at break not higher than 7.5%; and  
 said compressible layer has a thickness falling within a range of between 0.5 mm and 2.15 mm.  
 
 
     
     
       2. The rubber blanket for an offset printing according to  claim 1 , which satisfies formulas (1) and (2) given below:
   B≦A≦C  (1)  
 
        B≦D≦C  (2)
 where “A” represents the thickness (mm) of said surface rubber layer, “B” represents the thickness (mm) of said first fabric layer, “C” represents the thickness (mm) of said compressible layer, and “D” represents the thickness (mm) of said second fabric layer.  
 
     
     
       3. The rubber blanket for an offset printing according to  claim 1 , wherein the thickness of said surface rubber layer falls within a range of between 0.25 mm and 0.8 mm. 
     
     
       4. The rubber blanket for an offset printing according to  claim 1 , wherein the thickness of said compressible layer falls within a range of between 0.5 mm and 1.1 mm. 
     
     
       5. The rubber blanket for an offset printing according to  claim 1 , wherein the thickness of said first fabric layer falls within a range of between 0.2 mm and 0.3 mm and the thickness of said second fabric layer falls within a range of between 0.35 mm and 0.45 mm. 
     
     
       6. The rubber blanket for an offset printing according to  claim 1 , wherein the tensile strength of said second fabric layer is not lower than 55 kgf/cm. 
     
     
       7. The rubber blanket for an offset printing according to  claim 1 , wherein the elongation at break of said second fabric layer is not higher than 6.5%. 
     
     
       8. The rubber blanket for an offset printing according to  claim 1 , further comprising: a first adhesive layer provided between said surface rubber layer and said first fabric layer; a second adhesive layer provided between said first fabric layer and said compressible layer; and a third adhesive layer provided between said compressible layer and said second fabric layer, wherein a total thickness of said first to third adhesive layers falls within a range of not more than 0.1 mm.